moonbridge

annotate example_application.lua @ 61:54d488774467

Set default fork delay to 0.25 seconds
author jbe
date Tue Mar 24 15:24:31 2015 +0100 (2015-03-24)
parents e3df61bf62f4
children 7014436d88ea
rev   line source
jbe@0 1 -- Moonbridge example application
jbe@0 2 -- invoke with ./moonbridge example_application.lua
jbe@33 3 --
jbe@33 4 -- see helloworld.lua for a simpler example
jbe@0 5
jbe@4 6 local http = require "moonbridge_http"
jbe@0 7
jbe@26 8 -- preparation before forking:
jbe@13 9 local documents = {}
jbe@13 10 for i, document_name in ipairs{"example_webpage.html", "example_webpage.css"} do
jbe@15 11 local file = assert(io.open(document_name))
jbe@26 12 documents[document_name] = file:read("*a") -- store file contents in memory
jbe@13 13 file:close()
jbe@13 14 end
jbe@0 15
jbe@0 16 listen{
jbe@0 17 -- listen to a tcp version 4 socket
jbe@0 18 { proto = "tcp4", port = 8080, localhost = true },
jbe@0 19
jbe@0 20 -- listen to a tcp version 6 socket
jbe@0 21 { proto = "tcp6", port = 8080, localhost = true },
jbe@0 22
jbe@0 23 -- listen to a unix domain socket
jbe@0 24 --{ proto = "local", path = 'socket' },
jbe@0 25
jbe@0 26 -- execute the listener regularly (without incoming connection)
jbe@0 27 --{ proto = "interval", name = "myint", delay = 10, strict = false },
jbe@0 28
jbe@0 29 -- desired number of spare (idle) processes
jbe@0 30 pre_fork = 1, -- number of forks
jbe@0 31
jbe@0 32 -- minimum number of processes
jbe@0 33 min_fork = 2, -- number of forks
jbe@0 34
jbe@0 35 -- maximum number of processes (hard limit)
jbe@0 36 max_fork = 16, -- number of forks
jbe@0 37
jbe@0 38 -- delay between creation of spare processes
jbe@61 39 fork_delay = 0.25, -- seconds
jbe@0 40
jbe@0 41 -- delay before retry of failed process creation
jbe@0 42 fork_error_delay = 2, -- seconds
jbe@0 43
jbe@0 44 -- delay between destruction of excessive spare processes
jbe@0 45 exit_delay = 60, -- seconds
jbe@0 46
jbe@0 47 -- idle time after a fork gets terminated
jbe@0 48 idle_timeout = 0, -- seconds (0 for no timeout)
jbe@0 49
jbe@0 50 -- maximum memory consumption before process gets terminated
jbe@23 51 --memory_limit = 1024*1024, -- bytes
jbe@0 52
jbe@11 53 -- preparation of process (executed after fork)
jbe@0 54 prepare = function()
jbe@26 55 -- e.g. open database connection
jbe@0 56 end,
jbe@0 57
jbe@0 58 -- connection handler
jbe@0 59 connect = http.generate_handler(
jbe@0 60 {
jbe@0 61 static_headers = {"Server: Moonbridge Example Server"},
jbe@54 62 request_body_size_limit = 16*1024*1024*1024, -- allow big file uploads
jbe@54 63 request_header_timeout = 360, -- request headers must be sent within 6 minutes (if nil, defaults to timeout below)
jbe@54 64 timeout = 1800 -- request body and response must be sent within 30 minutes
jbe@0 65 },
jbe@0 66 function(request)
jbe@0 67
jbe@33 68 local function error_response(status)
jbe@33 69 request:send_status(status)
jbe@33 70 request:send_header("Content-Type", "text/html")
jbe@33 71 request:send_data("<html>\n<head><title>", status, "</title></head>\n<body><h1>", status, "</h1></body>\n</html>\n")
jbe@33 72 request:finish()
jbe@23 73 end
jbe@23 74
jbe@0 75 if request.method == "GET" or request.method == "HEAD" then
jbe@0 76
jbe@10 77 if request.path == "" then
jbe@0 78 request:send_status("303 See Other")
jbe@0 79 request:send_header("Location", "http://" .. request.headers_value.host .. "/example_webpage.html")
jbe@0 80
jbe@0 81 else
jbe@10 82 local document_name = request.path
jbe@0 83 local document_extension = string.match(document_name, "%.([^.])$")
jbe@26 84 local document = documents[document_name] -- loads file contents from memory
jbe@0 85 if document then
jbe@0 86 request:send_status("200 OK")
jbe@0 87 if document_extension == "html" then
jbe@0 88 request:send_header("Content-Type", "text/html; charset=UTF-8")
jbe@0 89 elseif document_extension == "css" then
jbe@0 90 request:send_header("Content-Type", "text/css; charset=UTF-8")
jbe@0 91 end
jbe@0 92 request:send_data(document)
jbe@0 93 else
jbe@33 94 error_response("404 Not Found")
jbe@0 95 end
jbe@0 96
jbe@0 97 end
jbe@0 98
jbe@0 99 elseif request.method == "POST" then
jbe@0 100
jbe@10 101 if request.path == "post_example" then
jbe@0 102 local files = {}
jbe@0 103 do
jbe@0 104 local file
jbe@0 105 request:stream_post_param("files", function(chunk, field_name, meta)
jbe@0 106 if meta then
jbe@0 107 file = {
jbe@0 108 file_name = meta.file_name,
jbe@0 109 content_type = meta.content_type,
jbe@0 110 length = 0
jbe@0 111 }
jbe@0 112 end
jbe@0 113 if chunk then
jbe@0 114 file.length = file.length + #chunk
jbe@0 115 else
jbe@0 116 files[#files+1] = file
jbe@0 117 end
jbe@0 118 end)
jbe@0 119 end
jbe@0 120
jbe@0 121 request:send_status("200 OK")
jbe@0 122 request:send_header("Content-Type", "text/html; chatset=UTF-8")
jbe@0 123 request:send_data("<html>\n<head>\n")
jbe@0 124 request:send_data('<link href="example_webpage.css" rel="stylesheet" type="text/css">\n')
jbe@0 125 request:send_data("<title>Moonbridge Network Server for Lua Applications &ndash; Example Application</title>\n")
jbe@0 126 request:send_data("</head>\n<body>\n")
jbe@0 127 request:send_data("<h1>Moonbridge Network Server for Lua &ndash; Example Application</h1>\n")
jbe@0 128 request:send_data("<h2>POST request successful</h2>\n")
jbe@0 129 request:send_data('<table>\n<thead><th>File name</th><th>Content type</th><th class="numeric">Bytes received</th></thead>\n<tbody>\n')
jbe@0 130 for i, file in ipairs(files) do
jbe@0 131 request:send_data("<tr>")
jbe@0 132 request:send_data("<td>", http.encode_html(file.file_name or "(unknown)"), "</td>")
jbe@0 133 request:send_data("<td>", http.encode_html(file.content_type or "(unknown)"), "</td>")
jbe@0 134 request:send_data('<td class="numeric">', http.encode_html(tostring(file.length)), "</td>")
jbe@0 135 request:send_data("</tr>\n")
jbe@0 136 end
jbe@0 137 request:send_data("</tbody>\n</table>\n")
jbe@0 138 request:send_data("<p>Submitted comment: ", http.encode_html(request.post_params.comment), "</p>\n")
jbe@0 139 request:send_data("</body>\n</html>\n")
jbe@0 140
jbe@0 141 else
jbe@33 142 error_response("404 Not Found")
jbe@0 143
jbe@23 144 end
jbe@0 145
jbe@0 146 else
jbe@33 147 error_response("405 Method not allowed")
jbe@0 148
jbe@0 149 end
jbe@0 150
jbe@0 151 -- returning false causes termination of current process (and re-forking)
jbe@0 152 return true
jbe@0 153 end),
jbe@0 154
jbe@0 155 -- executed on process termination
jbe@0 156 finish = function()
jbe@26 157 -- e.g. close database connection
jbe@0 158 end
jbe@0 159 }
jbe@0 160

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